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128 Nemesis (A872 WA)
Classification: Main-belt Asteroid          SPK-ID: 2000128
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 117 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .127989423985719 1.8822e-08  
a 2.74837624908398 6.6907e-09 au
q 2.39661315606769 5.068e-08 au
i 6.245638425109926 6.9287e-07 deg
node 76.23336725212614 9.2464e-06 deg
peri 303.5662801014153 1.5076e-05 deg
M 244.33115308872 1.2127e-05 deg
tp 2459931.220226871478
(2022-Dec-17.72022687)
5.7034e-05 TDB
period 1664.227549716841
4.56
6.0772e-06
1.664e-08
d
yr
n .2163165728516223 7.8991e-10 deg/d
Q 3.100139342100269 7.5471e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3072  
   data-arc span      54312 days (148.70 yr)  
   first obs. used      1872-11-26  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47167  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 21:04:08  

Additional Information
 Earth MOID = 1.40565 au 
 Jupiter MOID = 2.36756 au 
 T_jup = 3.326 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.72   n/a E2020-QM5 IRAS observations used: 12
diameter diameter 162.515 km 1.296 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 77.81 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pilcher, F. (2015) Minor Planet Bull. 42, 190-192.]
geometric albedo albedo 0.067   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.685   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=13.02, mean=16.03, max.=19.03) deg.
U-B UB 0.392   0.044 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=13.02, mean=16.03, max.=19.03) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

128 Nemesis (A872 WA)          Discovered 1872-Nov-25 by Watson, J. C. at Ann Arbor
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A872 WA = 1952 HW1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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